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-18+s=-s
We move all terms to the left:
-18+s-(-s)=0
We add all the numbers together, and all the variables
s-(-1s)-18=0
We get rid of parentheses
s+1s-18=0
We add all the numbers together, and all the variables
2s-18=0
We move all terms containing s to the left, all other terms to the right
2s=18
s=18/2
s=9
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